Work-holder for pipe-threading tools.



. 1. w. NONNEM AN. WORK HOLDER FOR PIPE THREADING TOOLS.

APPLICATION FILED AUG. 9, 1909.

953,971 Patented Apr,5,1910.

invirnn STATES PATENT 0mm IRA W. NONNEMAN, OF WARREN, OHIO, ASSIGNOR TOTHE BURDEN COMPANY, OF

' WARREN, OHIO, A CORPORATION OF OHIO.

WORK-HOLDER FOR PIPE-TI-IREADING TOOLS.

To all whom it may concern:

Be it known that I, Inn WV. NONNEMAN, of YVarren, in the county ofTrumbull and State of Ohio, have invented certain new and usefulImprovements in fork-Holders for Pipe-Threading Tools; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

The primary object of this invention is to provide improved means foraccurately and securely centering pipes of various sizes,

within the capacity of a pipe threading tool. And a further object is toeffect by improved and highly efficient means the simultaneousadjustment of a plurality of pipe-engaging members by the manipulationof a single member.

The invention will be hereinafter fully set forth and particularlypointed out in the claims.

In the accompanying drawings, Figure 1 is a View in side elevation. Fig.2 is an end elevation with parts broken away. Fig. 8 is an inner faceview of the cam plate. Fig. a is a view of the adjusting screw detached.

Referring to the drawings, 1 designates the housing of a work holder ofa pipe threading tool, which housing has a series of radial guidewayswhich in the present instance are shown as being formed by cutting awayopposite portions of inner and outer concentric flanges 2 and 3. Withinthese guideways fit pipe-engaging members 4 which are shown asapproximately square in cross section and roughened or pointed on theirinner ends to prevent slipping and insure firm enga ement with pipesupon which the tool is being centered. ,Each of these members has anoutwardly projecting lug 5, and in one member works a screw 6 which isheld as against moving longitudinally by its bearing 7 which projectsfrom the periphery of the housing. To the outer end of this screw ispivoted a handle 8 by turning which the pipe-engaging member in whichthe screw works may be moved inward or outward.

For the purpose of effecting the simultaneous adjustment of all thepipeengaging members through the longitudlnal movement of thescrew-actuated member, I provide a rotatable circular plate 9 which onits inner Specification of Letters Patent.

Application filed. August 9, 1909.

Patented Apr. 5, 1910.

Serial No. 511,977.

face has a series of eccentric grooves 10 which take in the lugs of theseveral pipeengaging members. This plate has a central opening, and isshown as being held to the outer face of the housing by a retainingplate 12, which latter has a circular flange 13 around its centralopening which fits in a recess surrounding the opening of cam plate 9.This latter plate is shown as corresponding in diameter to that of thehousing, while the retaining plate is shown as slightly larger and asbeing held by screws 14 to posts 15 of the housing. The flange 18 of'the retaining plate insures the accurate centering of the cam plate andprevents any binding of the latter by reason of the end thrustoccasioned by turning the screw. In

consequence when such screw is turned, causing its respectivepipe-engaging member to travel either inward or outward, the cam plateis forced to rotate axially by reason of the engagement of the lug ofsuch mem her with the wall of its respective eccentric groove. Thisturning of the cam plate will cause the simultaneous adjustment of theremaining pipe-engaging members, all of which move in unison. Thus itwill be seen that by adjusting the screw centered in one pipe-engagingmember the cam plate will be caused to rotate and efiect the uniformadjustment of the remaining members. In this way all of the members willengage a pipe simultaneously and under uniform pressure.

A work-holder thus constructed is simple in operation, strong anddurable, and its use greatly facilitates the centering of a pipethreading tool on pipes to be threaded.

I claim as my invention 1. A work holder for pipe threading toolscomprising a housing having a series of radial guideways, a series ofpipe clamping members fitted in such guideways, a plate rotatablymounted on said housing and having interlocking engagement with saidmembers to effect the longitudinal movement thereof by the axial turningof such plate, a screw mounted in said housing and engaging one of saidmembers for moving it inward or outward to effect the axial rotation ofsuch plate and the simultaneous adjustment of the remaining members, anda retaining plate mounted on said housing and having a bearing for saidformer plate.

2. A work holder for pipe threading tools comprising a housing having aseries of radial guideways, a series of pipe clamping members fitted insaid guideways, each of said members having a lug, a plate rotatablymounted on said housing and having a series of eccentric grooves fortaking in said lugs, a screw working in one of said members and havingits bearing in said housing, and a retaining plate secured to saidhousing having a central circular flange with which 10 said former plateengages.

I11 testimony whereof, I have signed this specification in the presenceof tWo subscribing Witnesses.

IRA V. NONNEh/IAN.

Vitnesses J B. PHILLIPS, A. J. SUTCLIFFE.

